NOS Osram HQI-TS 70W/WDL pre-Excellence from 1988

I bought this lamp at eBay. Despite WDL, it have Sn-In-Tl-Na like the NDL one and unlike the single ended HQI-T 70W/WDL. There is also Li impurity.
Despite the presence of tin, the arc isn't diffused at all, which means that my Venture MH-DE 70W/UVS/PDX also have it, which is reasonable for the vapor afterglow when turning off the lamp.
What is strange, the electrodes looks different than that of my MH lamps: They looks like tungsten coils.
This lamp have a UVC transmitting quartz jacket, because of the warning on the package and the outer don't glowing under UV. I hope that the glass cover of my tracklight would protect from it.

File information
Filename:	IMG_0985.JPG
Album name:	dor123 / Lamps
Manufacturer:	Osram, Germany
Type/Model:	HQI-TS 70W/WDL
Wattage:	70W
Date manufactured:	October 1988 (Date code: qA4)
Filesize:	1309 KiB
Date added:	25 Dec, 2025
Dimensions:	2048 x 1536 pixels
Displayed:	500 times
URL:	http://80.229.24.59:9232/gallery/displayimage.php?pid=24011
Favourites:	Add to Favourites

Comment 1 to 5 of 5

Page: 1

AngryHorse

[29 Dec, 2025 at 10:14 AM]

Nice you can still get hold of the early ones Cool

dor123

[02 Jun, 2026 at 04:11 PM]

@AngryHorse: The problem, is that this lamp was made at 1985-1987 before the invention of the UV doping quartz, so the outer is transparent to UVC. So I can use it only at the winter, because it would cause me to sweat if I would use it in the summer.

AngryHorse

[02 Jun, 2026 at 04:40 PM]

When you say the electrodes are like tungsten coils, do you mean like the Philips ones without the central shank?

dor123

[02 Jun, 2026 at 06:51 PM]

The electrodes in this lamp, are large coils.

dor123

[03 Jun, 2026 at 03:56 PM]

I can't capture the electrodes of this lamp, when it isn't operates, because the arctube is very small.

Comment 1 to 5 of 5

Page: 1